A proportional valve for a mold temperature controller

Abstract

The utility model relates to a proportional valve for mould temperature controller, including valve seat, valve body and valve core, valve body has valve cavity, first interface, second interface and third interface, be provided with upper baffle and lower baffle in valve cavity, upper baffle, lower baffle divide valve cavity into upper valve cavity, middle valve cavity and lower valve cavity, respectively set up upper perforation, lower perforation on upper baffle, lower baffle, first interface communicates with upper valve cavity, second interface communicates with middle valve cavity, third interface communicates with lower valve cavity, valve core includes movable rod, upper sealing block and lower sealing block, upper sealing block, lower sealing block all install on movable rod, upper sealing block is at the inboard side of upper perforation and cooperates with the hole wall of upper perforation, lower sealing block is at the inboard side of lower perforation and cooperates with the hole wall of lower perforation, install lifting drive mechanism of valve core can drive on valve seat and lift. This proportional valve not only can effectively control water temperature, temperature control precision is high, and fluctuation is small, and cost is low, and service life is long.

Description

Technical Field

[0001] This utility model relates to the field of proportional valve technology, specifically to a proportional valve for mold temperature controllers. Background Technology

[0002] As a key temperature control device in industrial processes such as injection molding, die casting, and extrusion molding, the core function of a mold temperature controller is to ensure product molding quality, reduce internal stress and deformation, and improve production efficiency by precisely adjusting the mold temperature.

[0003] Currently, most mold temperature controllers on the market use proportional valves or solenoid valves to control constant water temperature. However, both types of valves have their own drawbacks in practical use. Specifically, while existing proportional valves can achieve relatively continuous proportional regulation, their purchase cost is high, and they are sensitive to the quality of the medium during use. Poor water quality can easily clog the proportional valve's water pipes, shortening its service life and resulting in high maintenance costs. On the other hand, while existing solenoid valves have a relatively lower purchase cost, their temperature control accuracy is low, and they fluctuate greatly. Moreover, the rapid opening and closing of solenoid valves can cause severe water pressure shocks (water hammer effect) in the pipeline, leading to pipeline vibration and significant noise. Long-term water hammer can also threaten the safety of pipes, joints, and other pipeline components, shortening the overall service life of the temperature controller. Utility Model Content

[0004] The technical problem this invention aims to solve is to provide a proportional valve for mold temperature controllers. This proportional valve not only effectively regulates water temperature with high accuracy and minimal fluctuation, but also has low cost and long service life. The technical solution adopted is as follows: A proportional valve for a mold temperature controller includes a valve seat, a valve body, and a valve core. The valve body is mounted on the valve seat. The valve body has a valve cavity, a first interface, a second interface, and a third interface. An upper partition and a lower partition are provided in the valve cavity, dividing it into an upper valve cavity, a middle valve cavity, and a lower valve cavity arranged from top to bottom. Corresponding upper and lower through holes are respectively formed on the upper and lower partitions. The upper valve cavity communicates with the middle valve cavity through the upper through hole, and the middle valve cavity communicates with the lower valve cavity through the lower through hole. The first interface communicates with the upper valve cavity, and the second interface communicates with the lower valve cavity. The valve core is connected to the middle valve cavity, and the third interface is connected to the lower valve cavity. The valve core includes a movable rod, an upper sealing block, and a lower sealing block. The movable rod is arranged in the valve cavity along the vertical direction. The upper sealing block and the lower sealing block are both installed on the movable rod. The upper sealing block is located inside the upper through hole and cooperates with the hole wall of the upper through hole. The lower sealing block is located inside the lower through hole and cooperates with the hole wall of the lower through hole. The cross-sectional area of ​​the upper sealing block gradually increases from top to bottom, and the cross-sectional area of ​​the lower sealing block gradually decreases from top to bottom. A lifting drive mechanism capable of driving the valve core to rise and fall is installed on the valve seat.

[0005] In the aforementioned proportional valve structure, the lifting drive mechanism is used to drive the valve core to rise or fall a certain height, allowing the movable rod and its upper and lower sealing blocks to switch between three different height positions: When the valve core is driven down to the lowest height position by the lifting drive mechanism, the outer circumferential surface of the upper part of the lower sealing block seals against the wall of the lower through hole, completely sealing the lower through hole; the outer circumferential surface of the upper part of the upper sealing block forms an upper annular gap with the wall of the upper through hole, allowing the middle valve chamber to communicate with the upper valve chamber only through the upper annular gap; when the valve core reaches the middle height position under the drive of the lifting drive mechanism... When the valve core is at its highest position, a lower annular gap is formed between the outer peripheral surface of the middle part of the lower sealing block and the wall of the lower perforation, and an upper annular gap is formed between the outer peripheral surface of the middle part of the upper sealing block and the wall of the upper perforation, so that the upper valve chamber communicates with the middle valve chamber through the upper annular gap, and the middle valve chamber communicates with the lower valve chamber through the lower annular gap; when the valve core rises to the highest position under the drive of the lifting drive mechanism, the outer peripheral surface of the lower part of the upper sealing block is in sealing contact with the wall of the upper perforation, and a lower annular gap is formed between the outer peripheral surface of the lower part of the lower sealing block and the wall of the lower perforation, and the middle valve chamber communicates with the lower valve chamber only through the lower annular gap.

[0006] The aforementioned proportional valve can be used in a mold temperature controller. The mold temperature controller also includes a heating tank, a water pump, a cooling tower, a check valve, and a roller. The first port of the proportional valve, the heating tank, the water pump, the medium channel of the roller, and the second port of the proportional valve are sequentially connected through multiple first water supply pipes to form a circulation loop A. The third port of the proportional valve, the cooling tower, the check valve, the heating tank, the water pump, the medium channel of the roller, and the second port of the proportional valve are sequentially connected through multiple second water supply pipes to form a circulation loop B. The heating tank is equipped with a heating tube and a thermal resistor. The heating tube heats the water entering the heating tank, and the thermal resistor detects the water temperature and feeds it back to the temperature controller. The cooling tower cools the water entering the tank. The thermal resistor in the heating tank is electrically connected to the corresponding input terminal of the mold temperature controller's control system. The lifting drive mechanism of the proportional valve and the heating tube in the heating tank are electrically connected to the corresponding output terminal of the mold temperature controller's control system. During operation, when the mold temperature controller is turned on and the water temperature inside the roller needs to be raised to 50°C, the control system controls the lifting drive mechanism of the proportional valve to drive the valve core to the lowest position, so that the middle valve chamber is connected to the upper valve chamber only through the upper annular gap, thereby opening circulation loop A and closing circulation loop B. At this time, water enters the middle valve chamber of the proportional valve from the medium channel of the roller, and then enters the upper valve chamber through the upper annular gap. Then, it enters the heating tank through the first interface and the corresponding first water supply pipe to heat the water, raising the water temperature to 50°C. If the water temperature inside the roller exceeds 50°C and needs to be slightly cooled, the control system will stop the heating tubes in the heating tank and simultaneously control the lifting drive mechanism to slightly raise the movable rod to the middle height position. This allows the upper valve chamber to communicate with the middle valve chamber through the upper annular gap, and the middle valve chamber to communicate with the lower valve chamber through the lower annular gap. This opens circulation loop A and circulation loop B simultaneously. At this time, after the hot water enters the middle valve chamber of the proportional valve from the roller, part of it enters the heating tank through circulation loop A, and the other part is discharged to the external cooling tower for cooling through circulation loop B. As the water volume inside the roller decreases, the pressure will drop, so the cold water from the cooling tower enters the heating tank through the one-way valve, thereby lowering the temperature of the water inside the roller. If the water temperature inside the roller remains above 50°C and rapid cooling is required, the control system controls the lifting drive mechanism to raise the valve core to its highest position. This connects the middle valve chamber to the lower valve chamber only through the lower annular gap, closing circulation loop A and opening circulation loop B. This increases the amount of hot water discharged through circulation loop B and the amount of cold water replenished through the check valve, thus rapidly reducing the water temperature inside the roller. If the water temperature inside the roller continues to drop below 50°C and requires heating, the control system activates the heating element and simultaneously lowers the valve core to its intermediate height position. At this point, the amount of water discharged to the outside through circulation loop B decreases, and the amount of cold water replenished from the outside also decreases, thus rapidly raising the water temperature inside the roller.Therefore, when this type of proportional valve is applied in a mold temperature controller, the water flow ratio can be controlled by switching the position of the valve core to effectively regulate the water temperature. It not only has high temperature control accuracy and small temperature fluctuation, effectively controlling the error within ±1℃ of the ideal temperature, but also can be mass-produced at a low cost and can greatly reduce the wear of the valve core, thereby extending its service life.

[0007] As a preferred embodiment of this utility model, the lifting drive mechanism includes an electric push rod, the cylinder of which is mounted on the valve seat, and the telescopic rod of the electric push rod extends downward and is connected to the upper end of the movable rod. With this structure, the movable rod can be driven to rise or fall by extending or retracting the telescopic rod of the electric push rod, thereby causing the upper and lower sealing blocks on it to rise or fall together.

[0008] As a further preferred embodiment of this utility model, the valve body is connected to the valve seat through a vertically oriented bushing, and the telescopic rod of the electric push rod extends into the bushing and is connected to the upper end of the movable rod.

[0009] As a further preferred embodiment of this utility model, an O-ring is fitted on the outer side of the upper end of the movable rod, and the O-ring makes sealing contact with the inner wall of the bushing. The O-ring is used to completely seal the gap between the upper end of the movable rod and the inner wall of the bushing, so that the valve cavity of the valve body has better sealing performance.

[0010] In a preferred embodiment of this utility model, the lower sealing block is fixedly installed on the lower part of the movable rod, and the upper sealing block is provided with a guide hole running vertically. The upper sealing block is sleeved on the middle part of the movable rod through the guide hole and can slide up and down along the movable rod. The proportional valve also includes a spring, which is sleeved on the movable rod and located between the upper and lower sealing blocks. The upper and lower ends of the spring are connected to the upper and lower sealing blocks, respectively. When the movable rod rises under the drive of the lifting drive mechanism, the upper outer circumferential surface of the upper sealing block contacts the wall of the upper through hole and then stops moving. The spring is compressed and applies an upward force to the upper sealing block, so that the upper outer circumferential surface of the upper sealing block is tightly attached to the wall of the upper through hole.

[0011] Compared with the prior art, this utility model has the following advantages: When this type of proportional valve is used in mold temperature controllers, the water flow ratio can be controlled by switching the position of the valve core to effectively regulate the water temperature. It not only has high temperature control accuracy and small temperature fluctuation, effectively controlling the error within ±1℃ of the ideal temperature, but also can be mass-produced at a low cost and can greatly reduce the wear of the valve core, thereby extending its service life. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention.

[0013] Figure 2 yes Figure 1 The diagram shows the state of the proportional valve when it is used in a mold temperature controller. Detailed Implementation

[0014] like Figure 1 , Figure 2 As shown, this proportional valve 100 for a mold temperature controller includes a valve seat 1, a valve body 2, and a valve core 3. The valve body 2 is mounted on the valve seat 1 and has a valve cavity 20, a first interface 21, a second interface 22, and a third interface 23. An upper partition 24 and a lower partition 25 are provided in the valve cavity 20, dividing it into an upper valve cavity 201, a middle valve cavity 202, and a lower valve cavity 203 arranged from top to bottom. The upper partition 24 and the lower partition 25 have corresponding upper through holes 241 and lower through holes 251, respectively. The upper valve cavity 201 communicates with the middle valve cavity 202 through the upper through hole 241, and the middle valve cavity 202 communicates with the lower valve cavity 203 through the lower through hole 251. The first interface 21 is connected to the upper... The valve chamber 201 is connected, the second interface 22 is connected to the middle valve chamber 202, and the third interface 23 is connected to the lower valve chamber 203. The valve core 3 includes a movable rod 31, an upper sealing block 32, and a lower sealing block 33. The movable rod 31 is arranged in the valve chamber 20 along the vertical direction. The upper sealing block 32 and the lower sealing block 33 are both installed on the movable rod 31. The upper sealing block 32 is located inside the upper through hole 241 and cooperates with the hole wall of the upper through hole 241. The lower sealing block 33 is located inside the lower through hole 251 and cooperates with the hole wall of the lower through hole 251. The cross-sectional area of ​​the upper sealing block 32 gradually increases from top to bottom, and the cross-sectional area of ​​the lower sealing block 33 gradually decreases from top to bottom. An electric push rod 4 capable of driving the valve core 3 to rise and fall is installed on the valve seat 1.

[0015] In this embodiment, the valve body 2 is connected to the valve seat 1 via a vertically oriented bushing 5; the cylinder of the electric push rod 4 is mounted on the valve seat 1, and the telescopic rod of the electric push rod 4 extends downward into the bushing 5 and is connected to the upper end of the movable rod 31. With this structure, the movable rod 31 can be driven to rise or fall by extending or retracting the telescopic rod of the electric push rod 4, thereby causing the upper sealing block 32 and the lower sealing block 33 on it to rise or fall together.

[0016] In this embodiment, an O-ring 6 is fitted on the outer side of the upper end of the movable rod 31, and the O-ring 6 makes sealing contact with the inner wall of the bushing 5. The O-ring 6 is used to completely seal the gap between the upper end of the movable rod 31 and the inner wall of the bushing 5, so that the valve cavity 20 of the valve body 2 has good sealing performance.

[0017] In this embodiment, the lower sealing block 33 is fixedly installed on the lower part of the movable rod 31, and the upper sealing block 32 is provided with a guide hole 321 running vertically. The upper sealing block 32 is sleeved on the middle part of the movable rod 31 through the guide hole 321 and can slide up and down along the movable rod 31. The valve core 3 also includes a spring 34, which is sleeved on the movable rod 31 and located between the upper sealing block 32 and the lower sealing block 33. The upper end and the lower end of the spring 34 are connected to the upper sealing block 32 and the lower sealing block 33, respectively. When the movable rod 31 rises under the drive of the electric push rod 4, the upper outer peripheral surface of the upper sealing block 32 contacts the hole wall of the upper through hole 241 and stops moving. The spring 34 is compressed and applies an upward force to the upper sealing block 32, so that the upper outer peripheral surface of the upper sealing block 32 is in close contact with the hole wall of the upper through hole 241.

[0018] The working principle of a mold temperature controller containing this proportional valve 100 is briefly described below: The mold temperature controller also includes a heating tank 200, a water pump 300, a cooling tower 400, a one-way valve 500, and a roller 600. The first port 21 of the proportional valve 100, the heating tank 200, the water pump 300, the roller 600's medium channel, and the second port 22 of the proportional valve 100 are sequentially connected by multiple first water supply pipes 50 to form a circulation loop A. The third port 23 of the proportional valve 100, the cooling tower 400, the one-way valve 500, the heating tank 200, the water pump 300, the roller 600's medium channel, and the second port of the proportional valve 100... The two parts are connected in sequence by multiple second water supply pipes 60 to form a circulation loop B. The heating tank 200 is equipped with a heating tube and a thermal resistor. The heating tube can heat the water entering the heating tank 200, and the thermal resistor can detect the water temperature and feed it back to the temperature controller. The cooling tower 400 can cool the water entering it. The thermal resistor in the heating tank 200 is electrically connected to the corresponding input terminal of the mold temperature controller's control system. The electric push rod 4 of the proportional valve 100 and the heating tube in the heating tank 200 are electrically connected to the corresponding output terminal of the mold temperature controller's control system.

[0019] During operation, when the mold temperature controller is turned on and the water temperature inside the roller 600 needs to be raised to 50°C, the control system controls the electric push rod 4 of the proportional valve 100 to drive the valve core 3 to descend to the lowest position. The outer peripheral surface of the upper part of the lower sealing block 33 seals against the hole wall of the lower through hole 251, completely closing the lower through hole 251. The outer peripheral surface of the upper part of the upper sealing block 32 forms an upper annular gap 2410 with the hole wall of the upper through hole 241, so that the middle valve chamber 202 is connected to the upper valve chamber 201 only through the upper annular gap 2410, thereby opening the circulation loop A and closing the circulation loop B. At this time, water enters the middle valve chamber 202 of the proportional valve 100 from the medium channel of the roller 600, and then enters the upper valve chamber 201 through the upper annular gap 2410. Then, it enters the heating tank 200 through the first interface 21 and the corresponding first water supply pipe 50 for heating, raising the water temperature to 50°C. If the water temperature inside the roller 600 exceeds 50°C and needs to be slightly cooled, the control system controls the heating tube of the heating tank 200 to stop heating. Simultaneously, it controls the electric push rod 4 to drive the movable rod 31 slightly upwards to the middle height position. A lower annular gap 2510 is formed between the outer circumferential surface of the lower sealing block 33 and the wall of the lower through hole 251. An upper annular gap 2410 is formed between the outer circumferential surface of the upper sealing block 32 and the wall of the upper through hole 241. This allows the upper valve chamber 201 to communicate with the middle valve chamber 202 through the upper annular gap 2410. 202 is connected to the lower valve chamber 203 through the lower annular gap 2510, so that circulation loop A and circulation loop B can be opened simultaneously. At this time, after the hot water enters the middle valve chamber 202 of the proportional valve 100 from the roller 600, part of it enters the heating tank 200 through circulation loop A, and the other part is discharged to the external cooling tower 400 for cooling through circulation loop B. Since the water volume inside the roller 600 is reduced, the pressure will decrease. Therefore, the cold water in the cooling tower 400 enters the heating tank 200 through the one-way valve 500, thereby reducing the temperature of the water inside the roller 600. If the water temperature inside the roller 600 remains above 50°C and rapid cooling is required, the control system controls the electric push rod 4 to drive the valve core 3 to its highest position. The outer circumferential surface of the lower part of the upper sealing block 32 makes sealing contact with the hole wall of the upper through hole 241, and the outer circumferential surface of the lower part of the lower sealing block 33 forms a lower annular gap 2510 with the hole wall of the lower through hole 251. The middle valve chamber 202 communicates with the lower valve chamber 203 only through the lower annular gap 2510, thereby closing the circulation loop A and opening the circulation loop B. This causes the hot water discharged through the circulation loop B to increase continuously, and the cold water replenished through the one-way valve 500 to increase continuously, thus rapidly reducing the water temperature inside the roller 600.If the water temperature inside the roller 600 continues to drop below 50°C and needs to be raised, the control system will control the heating tube to start heating, and at the same time control the electric push rod 4 to drive the movable rod 31 to descend to the middle height position. At this time, the amount of water discharged to the outside through the circulation loop B is reduced, and the amount of cold water replenished to the outside of the roller 600 is also reduced, thereby rapidly raising the temperature of the water inside the roller 600.

[0020] Furthermore, it should be noted that the names of the various parts of the specific embodiments described in this specification may differ. All equivalent or simple variations made to the structure, features, and principles of this utility model patent are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined by the claims, all of which should fall within the protection scope of this utility model.

Claims

1. A proportional valve for a mold temperature controller, comprising a valve seat, a valve body, and a valve core, wherein the valve body is mounted on the valve seat, characterized in that: The valve body has a valve cavity, a first interface, a second interface, and a third interface. An upper partition and a lower partition are provided in the valve cavity, dividing it into an upper valve cavity, a middle valve cavity, and a lower valve cavity arranged from top to bottom. Corresponding upper and lower through holes are respectively formed on the upper and lower partitions. The upper valve cavity communicates with the middle valve cavity through the upper through hole, and the middle valve cavity communicates with the lower valve cavity through the lower through hole. The first interface communicates with the upper valve cavity, the second interface communicates with the middle valve cavity, and the third interface communicates with the lower valve cavity. The valve core includes a movable rod, an upper sealing block, and a lower sealing block. The movable rod is arranged in the valve cavity along the vertical direction. The upper and lower sealing blocks are both mounted on the movable rod. The upper sealing block is located inside the upper through hole and cooperates with the hole wall of the upper through hole. The lower sealing block is located inside the lower through hole and cooperates with the hole wall of the lower through hole. The cross-sectional area of ​​the upper sealing block gradually increases from top to bottom, and the cross-sectional area of ​​the lower sealing block gradually decreases from top to bottom. A lifting drive mechanism capable of driving the valve core to rise and fall is installed on the valve seat.

2. A proportional valve for a mold temperature controller according to claim 1, characterized in that: The lifting drive mechanism includes an electric push rod, the cylinder of which is mounted on the valve seat, and the telescopic rod of the electric push rod extends downward and is connected to the upper end of the movable rod.

3. A proportional valve for a mold temperature controller according to claim 2, characterized in that: The valve body is connected to the valve seat via a vertically oriented bushing, and the telescopic rod of the electric push rod extends into the bushing and is connected to the upper end of the movable rod.

4. A proportional valve for a mold temperature controller according to claim 3, characterized in that: An O-ring is fitted on the outer side of the upper end of the movable rod, and the O-ring is in sealing contact with the inner wall of the bushing.

5. A proportional valve for a mold temperature controller according to any one of claims 1-4, characterized in that: The lower sealing block is fixedly installed on the lower part of the movable rod. The upper sealing block is provided with a guide hole running vertically. The upper sealing block is sleeved on the middle part of the movable rod through the guide hole and can slide up and down along the movable rod. The proportional valve also includes a spring, which is sleeved on the movable rod and located between the upper sealing block and the lower sealing block. The upper end and the lower end of the spring are connected to the upper sealing block and the lower sealing block, respectively.

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